Forget those rusty, dirty, greasy, and sharp, chains that cause numerous problems while trying to ride a bike. Trek – the largest US bike manufacturer has developed two models where belts replace chains, providing a smoother ride than its foe. Besides being quieter, the belts also last three times longer than the traditional chains and do not need to be greased. The models will be released in December and will hopefully inspire people to rely less on gas and instead other ways of transportation.
http://www.cnn.com/2008/TECH/11/19/chainless.bicycles.ap/index.html
This would be really useful and also convince people to start riding bikes more instead of driving to closer places. Also bike chains get stuck and mess up a lot its pretty annoying.
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